Okay, here's my own two cents:
While not the best ending we could have hoped for, Bioware clearly put SOME effort in the Extended Cut. New animations and voice-overs, a clear re-modeling of what each ending means to the universe, filling in the most glaring plotholes (while still leaving some) and giving a form of closure. The 'refusal' ending, no matter what everyone says, at least had the merit of creating a vastly different ending. So we have Reapers destroy Organics ('Refusal') or Organics destroy Reapers (Destroy).
There are several things with which I am unhappy: a plot hole here and there, and not seeing any reunion with the LI (which was something I deeply wished for). However, overall these endings are better than the old ones in my opinion and I still wish to congratulate Bioware for making an amazing series from ME1 to ME3, despite the endings. The characters and storyline were stellar, and this series will probably remain my favourite game series of all time.
I personally chose Synthesis, despite my misgivings, because I couldn't bear the idea of my Shepard facing Joker and telling him it was her fault EDI was gone, not to mention Legion's sacrifice made for naught. Judge me for this, but Control felt too risky, and I preferred to give each race certain peace rather than risking the 'Shepard' to come to Star Child's conclusion and kill them all.
Seeing the Reapers rebuild along organics brought tears to my eyes though.
So here it is: I'm content. Not entirely satisfied, but it's better than I hoped for. I really wanted my Shepard to see her LI again, but I can live with that.
If people are still angry with these endings, it's their right. However... Let's just say that I think that now is not the time to hound Bioware again, but rather to thank them for what they gave us (my opinion only). ME3 was a hell of a game in my opinion despite some problems, and the new endings suit the series better. That is all.
Sis' out.